CN111772269B - Recyclable medical mask based on flexible super-electric structure and preparation method thereof - Google Patents

Recyclable medical mask based on flexible super-electric structure and preparation method thereof Download PDF

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CN111772269B
CN111772269B CN202010669781.9A CN202010669781A CN111772269B CN 111772269 B CN111772269 B CN 111772269B CN 202010669781 A CN202010669781 A CN 202010669781A CN 111772269 B CN111772269 B CN 111772269B
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carbon cloth
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mask
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CN111772269A (en
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罗绍华
闫绳学
王庆
张亚辉
刘忻
冯建
李鹏伟
张琳
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Northeastern University Qinhuangdao Branch
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    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
    • A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/02—Layered materials
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
    • A41D31/12—Hygroscopic; Water retaining
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
    • A41D31/14—Air permeable, i.e. capable of being penetrated by gases
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
    • A41D31/30—Antimicrobial, e.g. antibacterial
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces

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  • Textile Engineering (AREA)
  • Health & Medical Sciences (AREA)
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Abstract

The invention provides a recyclable medical mask based on a flexible super-electric structure, and relates to the technical field of medical care and epidemic prevention articles. The skin-friendly anti-wrinkle fabric sequentially comprises a skin-friendly inner layer, a PP fiber net filter layer, a super-electric layer and a non-woven fabric outer layer from one side attached to the skin; the super-electric layer comprises two layers of carbon cloth electrodes and a layer of grid electrolyte sandwiched between the two layers of carbon cloth electrodes. The mask transition layer composite material is made of the electrode material of the rechargeable high-power flexible supercapacitor, and has a good function of blocking bacteria, viruses, spray, aerosol and haze particles.

Description

Recyclable medical mask based on flexible super-electric structure and preparation method thereof
Technical Field
The invention relates to the technical field of medical care and epidemic prevention articles, in particular to a recyclable medical mask and a preparation method thereof.
Background
Since new corolla pneumonitis virus outbreaks in the early 2020, the mask is used as a basic epidemic prevention article, the supply is not in demand, even a first-line medical worker lacks mask protection, and people cannot go out and work because people cannot buy the mask. The maximum capacity of the mask in China is 2000 thousands of masks per day, and the current market demand is about 10 hundred million masks per day, and the supply and demand are different by 50 times.
Under the condition of conventional material and process optimization, by electret treatment of the intermediate layer material, namely the process of changing PP crystal into electret, the PP fiber with electret property can keep electric polarization and permanently and continuously form substances of an electric field around the PP fiber under the condition that no electric field exists outside, so that the electrostatic adsorption effect is strengthened, the fiber is charged, the aerosol where viruses are located is captured by static electricity, and meanwhile, the electret material has certain inhibiting and killing effects on microorganisms.
In a word, the PP fiber net subjected to electret treatment has the characteristics of high porosity, small-aperture bent pore passages, static electricity and sterilization, realizes multiple functions of mechanical capture (35%), static electricity capture (more than 60%) and sterilization, has the filtering efficiency of more than 95%, presents low resistance and high efficiency, and meets the requirements of the filtering capacity of the mask on particles and pathogens and the wearing comfort of the mask.
However, the electrostatic trapping mechanism which plays an important role in the filtration rate is based on the amount of surface electrostatic charges carried by electret fibers, and the amount of charges is a constant value in the prior art. Along with the extension of gauze mask wearing time, the static adsorbed layer that plays main adsorption in the gauze mask is met and is become invalid easily after water, and contains a large amount of vapor in people's the breathing steam, and after wearing a certain period, the vapor of accumulation can cause the gauze mask to become invalid in the gauze mask, and surface charge consumes, and surface potential decay, the filtration rate reduces fast, loses the effect that blocks the virus. It is an important and urgent need to extend the electrostatic adsorption lifetime of the middle layer filter material or to propose a new electrostatic generation method.
CN109077372A provides a PM2.5 antibiotic gauze mask filter core is prevented to rechargeable haze, has solved that traditional non-static gauze mask life cycle is short, filtration efficiency is low, and static class gauze mask static stability is poor, static is easily by the defect of neutralization, short-lived, provides a method that can let the static filter core use many times after charging repeatedly. However, the rechargeable mask required 6 minutes of charging and the charging voltage was 7 kV. The excessively high voltage has certain danger, and the charging time is too long, which is not favorable for the requirements of the mask in emergency.
Disclosure of Invention
Aiming at the problems in the prior art, the application provides a recyclable medical mask based on a flexible super-electric structure and a preparation method thereof. The mask transition layer composite material is made of the electrode material of the rechargeable high-power flexible supercapacitor, and has a good function of blocking bacteria, viruses, spray, aerosol and haze particles.
The technical scheme of the invention is as follows:
a recyclable medical mask based on a flexible super-electric structure sequentially comprises a skin-friendly inner layer, a PP fiber net filter layer, an ultra-electric layer and a non-woven fabric outer layer from one side attached to skin; the super-electric layer comprises two layers of carbon cloth electrodes and a layer of grid electrolyte sandwiched between the two layers of carbon cloth electrodes;
s1, the preparation method of the carbon cloth electrode comprises the following steps:
s1-1: washing the carbon felt CF for several times by using acetone and deionized water to remove surface impurities, and then immersing the CF into a 4-6M KOH solution for standing for 20-40 minutes to enable the KOH solution to fully soak the CF;
s1-2: putting the CF sample obtained in the step S1-1 into a deep-cooling refrigerator, freezing for 12-36 h at the temperature of-30 to-50 ℃, transferring into a freezing vacuum drier, and freezing and drying for 12-36 h at the temperature of-70 to-90 ℃;
s1-3: transferring the product obtained in the step S1-2 into a high-temperature tube furnace for calcination, and calcining the product at the temperature of 2-4 ℃ for min in a high-purity nitrogen atmosphere-1The temperature rising rate is increased to 700-900 ℃ for calcining for 1-3 h, and the temperature is slowly cooled to room temperature after the calcining process is finished;
s1-4: washing the sample obtained in the step S1-3 with deionized water and ethanol alternately for a plurality of times until the sample is neutral to obtain an activated carbon felt ACF, and placing the activated carbon felt ACF into a vacuum drying oven at 80-120 ℃ for standing and drying to obtain the carbon cloth electrode;
s2, the preparation step of the grid electrolyte comprises the following steps:
s2-1: heating 20-40 mL of deionized water to 80-100 ℃, then slowly adding 2-4 g of polyvinyl alcohol into the heated water while stirring, and stirring until clear gel appears to obtain PVA gel;
s2-2: adding 2-4 g of highly concentrated KOH into the cooled PVA gel, continuously stirring strongly until the KOH and the PVA are dissolved together to obtain a PVA-KOH gel electrolyte, and coating the PVA-KOH gel electrolyte on the carbon cloth electrode to obtain a grid electrolyte; the concentration of the highly concentrated KOH is 5-6M;
s3, the preparation step of the super-electric layer comprises the following steps:
s3-1: cutting the carbon cloth electrode prepared in the step S1 into the size and the shape of the mask;
s3-2: then, uniformly coating the gel electrolyte prepared in the step S2 on a layer of the carbon cloth electrode obtained in the step S3-1 in a screen printing mode to form a net;
s3-3: and (3) covering another layer of the carbon cloth electrode obtained in the step (3-1) on the reticular grid electrolyte obtained in the step (S3-2), and packaging the carbon cloth electrode with medical gauze to obtain the super-electric layer.
Preferably, the carbon felt is a commercial carbon felt with the bulk density of 1.0-2.0g/cm3。
Preferably, the skin-friendly layer, namely the moisture absorption layer, is made of medical gauze or spun-bonded non-woven fabric by a method of thermal bonding, curing and forming among fibers.
Preferably, the PP fiber mesh filter layer is equivalent to a melt-blown non-woven fabric bacteria filter layer of a common medical mask, and is prepared by melt extrusion and melt-blown trickle stretching of polypropylene.
Preferably, the recyclable medical mask based on the flexible super-electric structure further comprises a charging wire for charging, and the charging wire can be charged for multiple times to replenish charges lost in the grid electrolyte; and the positive electrode and the negative electrode of the charging wire are respectively positioned at the end parts of the carbon cloth electrodes.
Preferably, the recyclable medical mask is reused after being charged; the charging voltage is 2V, the charging current is 2A, and the charging time is 10-60 seconds.
The beneficial technical effects of the invention are as follows:
in the mask, the middle layer for playing the role of the blocking filter sheet comprises the electrostatic non-woven fabric layer, namely the PP fiber net filter layer and the super-electric layer are protected doubly. The medical mask is characterized in that the medical mask comprises a plurality of charging layers, wherein the charging layers are arranged on the mask body, the charging layers are arranged on the charging layers, and the charging layers are arranged on the charging layers.
In order to ensure the whole air permeability of the mask, the PVA-KOH gel electrolyte is made into a net structure by a screen printing method. The freeze drying of the carbon felt avoids the phenomenon of surface hardening caused by the precipitation of inorganic salt carried by the migration of water in the material to the surface in the traditional drying method, the dried material is loose and porous, and the volume is almost unchanged because the drying is carried out in a frozen state, the original structure is kept, and the concentration phenomenon cannot occur. According to the formula: the electric charge quantity (Q) is the current (I) x time (T), the mask can continuously provide electric charges through the charging process, and the problem that the filtering effect is reduced due to the disappearance of the electric charge quantity of the bacterium filtering layer of the mask for too long time is solved.
The mask provided by the invention has a compact structure and light self weight, and can be worn for a long time; the wearable device can meet various design requirements such as attractive appearance, functions and environmental protection, can quickly relieve supply and demand contradictions, and meets the urgent needs of the market. The mask can be efficiently used at one time, the aims of repeated use and resource consumption reduction of the mask can be realized by introducing a miniature flexible quick charging circuit, and the mask is low in charging voltage, short in charging time and very convenient in case of emergency.
Drawings
FIG. 1 is a schematic view of the mask of the present invention;
FIG. 2 is a schematic diagram of the structure of the super-electric layer and the arrangement of the charging wire interface; wherein, the carbon felt layer is the carbon cloth electrode, and the gel electrolyte is the grid electrolyte;
FIG. 3 is a schematic view of a charging and discharging curve of an ultra-electric layer according to the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the examples described below, the carbon felt used was a commercial carbon felt, model CCM-190C. The specific parameters are shown in the following table 1:
TABLE 1
Figure BDA0002581826940000051
Figure BDA0002581826940000061
The skin-friendly layer, namely the moisture absorption layer, is made of common medical gauze, and the PP fiber net filter layer is a melt-blown non-woven fabric bacteria filter layer of a common medical mask. The related electric equipment such as electrodes, wires and the like are all common commercial products.
Example 1:
as shown in fig. 1, the present embodiment provides a recyclable medical mask based on a flexible super-electric structure, which sequentially comprises, from a side attached to the skin, a skin-friendly inner layer, a PP fiber mesh filter layer, a super-electric layer, and a non-woven outer layer; the super-electric layer comprises two layers of carbon cloth electrodes and a layer of grid electrolyte sandwiched between the two layers of carbon cloth electrodes;
s1, the preparation method of the carbon cloth electrode comprises the following steps:
s1-1: washing the carbon felt CF for several times by using acetone and deionized water to remove surface impurities, and then immersing the CF into a 4M KOH solution and standing for 40 minutes to enable the KOH solution to fully soak the CF;
s1-2: putting the CF sample obtained in the step S1-1 into a deep cooling refrigerator, freezing for 36h at the temperature of minus 30 ℃, transferring into a freezing vacuum drier, and freezing and drying for 36h at the temperature of minus 70 ℃;
s1-3: transferring the product obtained in the step S1-2 into a high-temperature tube furnace for calcination, and calcining the product at the temperature of 2 ℃ for min in a high-purity nitrogen atmosphere-1The temperature rising rate is increased to 700 ℃ for calcining for 3h, and the temperature is slowly cooled to the room temperature after the calcining process is finished;
s1-4: washing the sample obtained in the step S1-3 with deionized water and ethanol alternately for a plurality of times until the sample is neutral to obtain an activated carbon felt ACF, and placing the activated carbon felt ACF into a vacuum drying oven at 80 ℃ for standing and drying to obtain the carbon cloth electrode;
s2, the preparation step of the grid electrolyte comprises the following steps:
s2-1: heating 20mL of deionized water to 80 ℃, then slowly adding 2g of polyvinyl alcohol into the heated water under stirring, and stirring until clear gel appears to obtain PVA gel;
s2-2: adding 2g of highly concentrated KOH with the concentration of 6M into the cooled PVA gel, continuously stirring strongly until the KOH and the PVA are dissolved together to obtain a PVA-KOH gel electrolyte, and coating the PVA-KOH gel electrolyte on the carbon cloth electrode to obtain a grid electrolyte;
s3, the preparation step of the super-electric layer comprises the following steps:
s3-1: cutting the carbon cloth electrode prepared in the step S1 into a mask with the size and the shape as follows: rectangle (16X 11 cm);
s3-2: uniformly coating the gel electrolyte prepared in the step S2 on a layer of the carbon cloth electrode obtained in the step S3-1 in a screen printing mode to form a net;
s3-3: and (3) covering another layer of the carbon cloth electrode obtained in the step (S3-1) on the reticular grid electrolyte obtained in the step (S3-2), and packaging the carbon cloth electrode by using medical gauze to obtain the super-electric layer.
As shown in fig. 2, the prepared recyclable medical mask based on the flexible super-electric structure further comprises a charging wire for charging, wherein the positive electrode and the negative electrode of the charging wire are respectively located at the end parts of the carbon cloth electrodes. The recyclable medical mask can be reused after being charged; the charging voltage is 2V, the charging current is 2A, and the charging time is 10-60 seconds.
Example 2:
as shown in fig. 1, the present embodiment provides a recyclable medical mask based on a flexible super-electric structure, which sequentially comprises, from a side attached to the skin, a skin-friendly inner layer, a PP fiber mesh filter layer, a super-electric layer, and a non-woven outer layer; the super-electric layer comprises two layers of carbon cloth electrodes and a layer of grid electrolyte sandwiched between the two layers of carbon cloth electrodes;
s1, the preparation method of the carbon cloth electrode comprises the following steps:
s1-1: washing the carbon felt CF for several times by using acetone and deionized water to remove surface impurities, and then immersing the CF into a 5M KOH solution and standing for 30 minutes to enable the KOH solution to fully soak the CF;
s1-2: putting the CF sample obtained in the step S1-1 into a deep cooling refrigerator, freezing for 24 hours at the temperature of minus 40 ℃, transferring into a freezing vacuum drier, and freezing and drying for 24 hours at the temperature of minus 80 ℃;
s1-3: transferring the product obtained in the step S1-2 into a high-temperature tube furnace for calcination, and calcining the product at 3 ℃ for min in a high-purity nitrogen atmosphere-1The temperature rising rate is increased to 800 ℃ for calcining for 2h, and the temperature is slowly cooled to room temperature after the calcining process is finished;
s1-4: washing the sample obtained in the step S1-3 with deionized water and ethanol alternately for a plurality of times until the sample is neutral to obtain an activated carbon felt ACF, and placing the activated carbon felt ACF into a vacuum drying oven at 100 ℃ for standing and drying to obtain the carbon cloth electrode;
s2, the preparation step of the grid electrolyte comprises the following steps:
s2-1: heating 30mL of deionized water to 90 ℃, then slowly adding 3g of polyvinyl alcohol into the heated water under stirring, and stirring until clear gel appears to obtain PVA gel;
s2-2: adding 3g of highly concentrated KOH with the concentration of 5M into the cooled PVA gel, continuously stirring strongly until the KOH and the PVA are dissolved together to obtain a PVA-KOH gel electrolyte, and coating the PVA-KOH gel electrolyte on the carbon cloth electrode to obtain a grid electrolyte;
s3, the preparation step of the super-electric layer comprises the following steps:
s3-1: cutting the carbon cloth electrode prepared in the step S1 into the size and the shape of the mask: rectangle (16X 11 cm);
s3-2: uniformly coating the gel electrolyte prepared in the step S2 on a layer of the carbon cloth electrode obtained in the step S3-1 in a screen printing mode to form a net;
s3-3: and (3) covering another layer of the carbon cloth electrode obtained in the step (3-1) on the reticular grid electrolyte obtained in the step (S3-2), and packaging the carbon cloth electrode with medical gauze to obtain the super-electric layer.
As shown in fig. 2, the prepared recyclable medical mask based on the flexible super-electric structure further comprises a charging wire for charging, wherein the positive electrode and the negative electrode of the charging wire are respectively located at the end parts of the carbon cloth electrodes. The recyclable medical mask can be reused after being charged; the charging voltage is 2V, the charging current is 2A, and the charging time is 10-60 seconds.
Example 3:
as shown in fig. 1, the present embodiment provides a recyclable medical mask based on a flexible super-electric structure, which sequentially comprises, from a side attached to the skin, a skin-friendly inner layer, a PP fiber mesh filter layer, a super-electric layer, and a non-woven outer layer; the super-electric layer comprises two layers of carbon cloth electrodes and a layer of grid electrolyte sandwiched between the two layers of carbon cloth electrodes;
s1, the preparation method of the carbon cloth electrode comprises the following steps:
s1-1: washing the carbon felt CF for several times by using acetone and deionized water to remove surface impurities, and then immersing the CF into 6M KOH solution for standing for 20 minutes to enable the KOH solution to fully soak the CF;
s1-2: putting the CF sample obtained in the step S1-1 into a deep-cooling refrigerator, freezing for 12 hours at the temperature of 50 ℃ below zero, transferring into a freezing vacuum drier, and freezing and drying for 12 hours at the temperature of 90 ℃ below zero;
s1-3: transferring the product obtained in the step S1-2 into a high-temperature tube furnace for calcination, and calcining the product at 4 ℃ for min in a high-purity nitrogen atmosphere-1The temperature rising rate is increased to 900 ℃ for calcining for 1h, and the temperature is slowly cooled to the room temperature after the calcining process is finished;
s1-4: washing the sample obtained in the step S1-3 with deionized water and ethanol alternately for a plurality of times until the sample is neutral to obtain an activated carbon felt ACF, and placing the activated carbon felt ACF into a vacuum drying oven at 120 ℃ for standing and drying to obtain the carbon cloth electrode;
s2, the preparation step of the grid electrolyte comprises the following steps:
s2-1: heating 40mL of deionized water to 100 ℃, then slowly adding 4g of polyvinyl alcohol into the heated water under stirring, and stirring until clear gel appears to obtain PVA gel;
s2-2: adding 4g of highly concentrated KOH with the concentration of 6M into the cooled PVA gel, continuously stirring strongly until the KOH and the PVA are dissolved together to obtain a PVA-KOH gel electrolyte, and coating the PVA-KOH gel electrolyte on the carbon cloth electrode to obtain a grid electrolyte;
s3, the preparation step of the super-electric layer comprises the following steps:
s3-1: cutting the carbon cloth electrode prepared in the step S1 into the size and the shape of the mask: rectangle (16X 11 cm);
s3-2: uniformly coating the gel electrolyte prepared in the step S2 on a layer of the carbon cloth electrode obtained in the step S3-1 in a screen printing mode to form a net;
s3-3: and (3) covering another layer of the carbon cloth electrode obtained in the step (3-1) on the reticular grid electrolyte obtained in the step (S3-2), and packaging the carbon cloth electrode with medical gauze to obtain the super-electric layer.
As shown in fig. 2, the prepared recyclable medical mask based on the flexible super-electric structure further comprises a charging wire for charging, wherein the positive electrode and the negative electrode of the charging wire are respectively located at the end parts of the carbon cloth electrodes. The recyclable medical mask can be reused after being charged; the charging voltage is 2V, the charging current is 2A, and the charging time is 10-60 seconds.
Test example:
subject: a disposable medical surgical mask on the market is used as a first control group, a medical absorbent gauze mask is used as a second control group, and the mask manufactured in the embodiment 1 of the invention is used as an experimental group.
The experimental requirements are as follows: the three groups of masks have consistent volume, consistent area and consistent simulated pressure.
The experimental method comprises the following steps: the sterilization rate, resistance and strength of disposable medical surgical masks, medical absorbent gauze masks and masks manufactured according to the embodiment 2 of the invention on the market are tested and the conditions are recorded. The same test was performed after wearing 4h, 8h and 12 h.
The experimental group of the super-electric layer is charged before each experiment, the charging voltage is 2V, the charging current is 2A, and the charging time is 20 seconds. The effect of the secondary medical mask after being used for multiple times is tested by ensuring that the super-electric layer has enough charges. The specific results are shown in the following tables 2 to 4:
table 2 test data after wearing for 4h
Figure BDA0002581826940000111
TABLE 3 test data after wearing for 8h
Figure BDA0002581826940000112
Figure BDA0002581826940000121
Table 4 test data after wearing for 12h
Item group classification Specific index Control group one Control group two Experimental group
Rate of sterilization Staphylococcus aureus 40.1 39.6 90.8
Escherichia coli 39.2 40.2 90.1
Candida albicans 41.4 40.1 89.9
Resistance force Air suction resistance (Pa) 39.7 38.2 39.1
Expiratory resistance (Pa) 20.1 20.9 20.0
Strength of Tensile Mild MD (MPa) 7.2 10.9 11.1
Tensile Strength TD (MPa) 4.1 8.0 8.9
In combination with the above, compared with results obtained by the same experimental method of disposable medical surgical masks, medical absorbent gauze masks and masks manufactured in the embodiment 1 of the invention in the market, test data of the masks of the invention are all in obvious advantages, so that the masks of the invention have the advantages of high bacterial filtration efficiency, small respiratory resistance and high tensile strength. And the mask still keeps the original filtering efficiency after secondary charging.
Fig. 3 is a charge and discharge curve of the ultra-electric filter layer at a current density of 2A/g, and it can be seen that the charge and discharge curve maintains a highly symmetrical form, showing a standard triangular profile, which is a typical electric double layer capacitance characteristic. Based on the following charge-discharge curve, the specific capacity of the ACF electrode at a current density of 2A/g was 89.2F/g by calculating the specific capacity Cs of the ACF. A large amount of charge can be provided to compensate for the loss of charge during wearing of the mask.
While the embodiments of the present invention have been disclosed above, it is not limited to the applications listed in the description and embodiments, but is fully applicable to various fields suitable for the present invention, and it will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principle and spirit of the present invention, and therefore the present invention is not limited to the specific details without departing from the general concept defined in the claims and the scope of equivalents thereof.

Claims (6)

1. The utility model provides a medical gauze mask of circulated use based on flexible super electric structure which characterized in that:
the skin-friendly anti-wrinkle fabric sequentially comprises a skin-friendly inner layer, a PP fiber net filter layer, a super-electric layer and a non-woven fabric outer layer from one side attached to the skin; the super-electric layer comprises two layers of carbon cloth electrodes and a layer of grid electrolyte sandwiched between the two layers of carbon cloth electrodes;
s1, the preparation method of the carbon cloth electrode comprises the following steps:
s1-1: washing the carbon felt CF for several times by using acetone and deionized water to remove surface impurities, and then immersing the CF into a 4-6M KOH solution for standing for 20-40 minutes to enable the KOH solution to fully soak the CF;
s1-2: putting the CF sample obtained in the step S1-1 into a deep-cooling refrigerator, freezing for 12-36 h at the temperature of-30 to-50 ℃, transferring into a freezing vacuum dryer, and freezing and drying for 12-36 h at the temperature of-70 to-90 ℃;
s1-3: transferring the product obtained in the step S1-2 into a high-temperature tube furnace for calcination, and calcining the product at the temperature of 2-4 ℃ for min in a high-purity nitrogen atmosphere-1The temperature rising rate is increased to 700-900 ℃ for calcining for 1-3 h, and the temperature is slowly cooled to room temperature after the calcining process is finished;
s1-4: washing the sample obtained in the step S1-3 with deionized water and ethanol alternately for a plurality of times until the sample is neutral to obtain an activated carbon felt ACF, and placing the activated carbon felt ACF into a vacuum drying oven at 80-120 ℃ for standing and drying to obtain the carbon cloth electrode;
s2, the preparation method of the electrolyte comprises the following steps:
s2-1: heating 20-40 mL of deionized water to 80-100 ℃, then slowly adding 2-4 g of polyvinyl alcohol into the heated water while stirring, and stirring until clear gel appears to obtain PVA gel;
s2-2: adding 2-4 g of highly concentrated KOH into the cooled PVA gel, and continuously stirring strongly until the KOH and the PVA are dissolved together to obtain a PVA-KOH gel electrolyte; the concentration of the highly concentrated KOH is 5-6M;
s3, the preparation step of the super-electric layer comprises the following steps:
s3-1: cutting the carbon cloth electrode prepared in the step S1 into the size and the shape of the mask;
s3-2: uniformly coating the gel electrolyte prepared in the step S2 on a layer of the carbon cloth electrode obtained in the step S3-1 in a screen printing mode to form a net;
s3-3: and (3) covering another layer of the carbon cloth electrode obtained in the step (3-1) on the reticular grid electrolyte obtained in the step (S3-2), and packaging the carbon cloth electrode with medical gauze to obtain the super-electric layer.
2. The reusable medical mask based on flexible ultrasound structure of claim 1, wherein: the carbon felt is a commercial carbon felt with the volume density of 1.0-2.0g/cm3。
3. The reusable medical mask based on flexible ultrasound structure of claim 1, wherein: the skin-friendly inner layer, namely the moisture absorption layer, is prepared from medical gauze or spun-bonded non-woven fabric by a method of thermal bonding, curing and forming among fibers.
4. The reusable medical mask based on flexible ultrasound structure of claim 1, wherein: the PP fiber net filter layer is equivalent to a melt-blown non-woven fabric bacteria filter layer of a common medical mask, and is prepared by melt extrusion and melt-blown trickle stretching of polypropylene.
5. The reusable medical mask based on flexible ultrasound structure of claim 1, wherein: the charging wire for charging is also included, and the charging wire can be charged for multiple times to supplement the charge lost in the grid electrolyte; and the positive electrode and the negative electrode of the charging wire are respectively positioned at the end parts of the carbon cloth electrodes.
6. The reusable medical mask based on flexible ultrasound structure of claim 1 or 5, wherein: the recyclable medical mask is reused after being charged; the charging voltage is 2V, the charging current is 2A, and the charging time is 10-60 seconds.
CN202010669781.9A 2020-07-13 2020-07-13 Recyclable medical mask based on flexible super-electric structure and preparation method thereof Active CN111772269B (en)

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CN112774867B (en) * 2021-02-22 2021-10-26 昆明理工大学 Filtering component based on ionic liquid and micro-electric field and application
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